linux-kernel - Re: SLUB performance regression vs SLAB

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Message-ID: <47055F84.109@redhat.com>
Date:	Thu, 04 Oct 2007 17:47:48 -0400
From:	Chuck Ebbert <cebbert@...hat.com>
To:	David Miller <davem@...emloft.net>
CC:	willy@...ux.intel.com, clameter@....com, nickpiggin@...oo.com.au,
	hch@....de, mel@...net.ie, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, dgc@....com, jens.axboe@...cle.com,
	suresh.b.siddha@...el.com
Subject: Re: SLUB performance regression vs SLAB

On 10/04/2007 05:11 PM, David Miller wrote:
> From: Chuck Ebbert <cebbert@...hat.com>
> Date: Thu, 04 Oct 2007 17:02:17 -0400
> 
>> How do you simulate reading 100TB of data spread across 3000 disks,
>> selecting 10% of it using some criterion, then sorting and
>> summarizing the result?
> 
> You repeatedly read zeros from a smaller disk into the same amount of
> memory, and sort that as if it were real data instead.

You've just replaced 3000 concurrent streams of data with a single
stream.  That won't test the memory allocator's ability to allocate
memory to many concurrent users very well.
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